Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Φυσική και Τεχνολογικές Εφαρμογές”
(EL)
In the present work differential crosssection
values for deuteron
elastic scattering from 6Li, 6Li(d,d0)6Li, were determined in the energy range
Ed;lab = 940 2000
keV in steps of 20 30
keV and for five backscattering
angles 125 , 140 , 150 , 160 , 170 suitable for Elastic Backscattering
Spectroscopy.
The experiment was carried out at the 5.5 MV Tandem Accelerator of
the Institute of Nuclear and Particle Physics (INPP), National Centre of
Scientific Research (NCSR) ‘‘Demokritos", Athens, Greece. The target used
for the crosssection
measurements was made at N.C.S.R. "Demokritos"
using the evaporation technique. At first, a small quantity of highpurity,
isotopically enriched 6LiF powder (97% in 6Li) was evaporated on
selfsupporting
carbon foils and an ultrathin
Au layer was subsequently
evaporated on top for normalization purposes. The detection system consisted
of five Si surface barrier detectors (SSB) which were mounted at the
laboratory scattering angles of 125 , 140 , 150 , 160 , and 170 , along with
the corresponding electronics. The spectra from all five detectors were
simultaneously recorded for each deuteron beam energy.
The determination of the differential crosssection
values for 6Li was
carried out using the relative measurement technique making use of the
differential crosssection
values of gold that follow the Rutherford formula.
Moreover, the enrichment of the target had to be determined. For this
purpose, proton EBS spectra from a similarly prepared thin natLiF target
were used at Ep;lab = 1600 keV and 1700 keV in five scattering angles (125 ,
140 , 150 , 160 , 170 ) along with the deuteron spectra.
Finally, the differential crosssection
values of the present work for
the elastic scattering process 6Li(d; d0)6Li and for the five backscattering
angles (125 , 140 , 150 , 160 , 170 ) are presented both in tabulated and
graphical form. The strong deviations from Rutherford formula and the
angular ditribution are both discussed.
(EN)
National Technical University of Athens
